The bill please

Start the app and place it on your restaurant table.
It will start with a blinking green light, showing the text "The bill, please".

-> No need to furiously wave with your hands, to whistle or to shout for the distracted waiter.
-> You won't miss the waiter, when he looks into your direction.

Additionally, there's a stop watch running. Just in case.
Just enjoy and wait for your bill...